Question: In a previous study conducted several years ago, a man owned on average 15 dress shirts. The standard deviation of the population is 3. A

In a previous study conducted several years ago, a man owned on average 15 dress shirts. The standard deviation of the population is 3. A researcher wishes to see if that average has changed. He selected a random sample of 42 men and found that the average number of dress shirts that they owned was 13.8. At α = 0.05, is there enough evidence to support the claim that the average has changed?

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